wxWidgets/interface/wx/brush.h
Vadim Zeitlin e6777e6575 Add wx{Pen,Brush}::Is[Non]Transparent() methods and use them.
Using GetStyle() == wx{PEN,BRUSH}STYLE_TRANSPARENT doesn't work for
uninitialized pen or brush objects so add convenient helpers which do work for
them.

Use the new helper functions everywhere instead of explicitly checking for
style. This makes the code shorter and more clear and also fixes some bugs (at
least those in GTK printing code).

Notice that this patch removes the main reason for explicitly initializing
m_pen and m_brush in wxGTKDCImpl ctor but this initialization still can't be
removed, at least for the latter, as doing this somehow breaks GetPixel(). It
would be nice to understand why and do remove this initialization so that a
newly created DC doesn't have any non-default pen nor brush.

Closes .

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@65820 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
2010-10-15 23:46:46 +00:00

381 lines
10 KiB
Objective-C

/////////////////////////////////////////////////////////////////////////////
// Name: brush.h
// Purpose: interface of wxBrush
// Author: wxWidgets team
// RCS-ID: $Id$
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
/**
The possible brush styles.
*/
enum wxBrushStyle
{
wxBRUSHSTYLE_INVALID = -1,
wxBRUSHSTYLE_SOLID = wxSOLID,
/**< Solid. */
wxBRUSHSTYLE_TRANSPARENT = wxTRANSPARENT,
/**< Transparent (no fill). */
wxBRUSHSTYLE_STIPPLE_MASK_OPAQUE = wxSTIPPLE_MASK_OPAQUE,
/**< Uses a bitmap as a stipple; the mask is used for blitting monochrome
using text foreground and background colors. */
wxBRUSHSTYLE_STIPPLE_MASK = wxSTIPPLE_MASK,
/**< Uses a bitmap as a stipple; mask is used for masking areas in the
stipple bitmap. */
wxBRUSHSTYLE_STIPPLE = wxSTIPPLE,
/**< Uses a bitmap as a stipple. */
wxBRUSHSTYLE_BDIAGONAL_HATCH = wxBDIAGONAL_HATCH,
/**< Backward diagonal hatch. */
wxBRUSHSTYLE_CROSSDIAG_HATCH = wxCROSSDIAG_HATCH,
/**< Cross-diagonal hatch. */
wxBRUSHSTYLE_FDIAGONAL_HATCH = wxFDIAGONAL_HATCH,
/**< Forward diagonal hatch. */
wxBRUSHSTYLE_CROSS_HATCH = wxCROSS_HATCH,
/**< Cross hatch. */
wxBRUSHSTYLE_HORIZONTAL_HATCH = wxHORIZONTAL_HATCH,
/**< Horizontal hatch. */
wxBRUSHSTYLE_VERTICAL_HATCH = wxVERTICAL_HATCH,
/**< Vertical hatch. */
wxBRUSHSTYLE_FIRST_HATCH = wxFIRST_HATCH,
wxBRUSHSTYLE_LAST_HATCH = wxLAST_HATCH,
};
/**
@class wxBrush
A brush is a drawing tool for filling in areas. It is used for painting
the background of rectangles, ellipses, etc. It has a colour and a style.
On a monochrome display, wxWidgets shows all brushes as white unless the
colour is really black.
Do not initialize objects on the stack before the program commences, since
other required structures may not have been set up yet. Instead, define
global pointers to objects and create them in wxApp::OnInit or when required.
An application may wish to create brushes with different characteristics
dynamically, and there is the consequent danger that a large number of
duplicate brushes will be created. Therefore an application may wish to
get a pointer to a brush by using the global list of brushes ::wxTheBrushList,
and calling the member function wxBrushList::FindOrCreateBrush().
This class uses reference counting and copy-on-write internally so that
assignments between two instances of this class are very cheap.
You can therefore use actual objects instead of pointers without efficiency problems.
If an instance of this class is changed it will create its own data internally
so that other instances, which previously shared the data using the reference
counting, are not affected.
@library{wxcore}
@category{gdi}
@stdobjects
@li ::wxNullBrush
@li ::wxBLACK_BRUSH
@li ::wxBLUE_BRUSH
@li ::wxCYAN_BRUSH
@li ::wxGREEN_BRUSH
@li ::wxYELLOW_BRUSH
@li ::wxGREY_BRUSH
@li ::wxLIGHT_GREY_BRUSH
@li ::wxMEDIUM_GREY_BRUSH
@li ::wxRED_BRUSH
@li ::wxTRANSPARENT_BRUSH
@li ::wxWHITE_BRUSH
@see wxBrushList, wxDC, wxDC::SetBrush
*/
class wxBrush : public wxGDIObject
{
public:
/**
Default constructor.
The brush will be uninitialised, and wxBrush:IsOk() will return @false.
*/
wxBrush();
/**
Constructs a brush from a colour object and @a style.
@param colour
Colour object.
@param style
One of the ::wxBrushStyle enumeration values.
*/
wxBrush(const wxColour& colour, wxBrushStyle style = wxBRUSHSTYLE_SOLID);
/**
Constructs a stippled brush using a bitmap.
The brush style will be set to @c wxBRUSHSTYLE_STIPPLE.
*/
wxBrush(const wxBitmap& stippleBitmap);
/**
Copy constructor, uses @ref overview_refcount "reference counting".
*/
wxBrush(const wxBrush& brush);
/**
Destructor.
See @ref overview_refcount_destruct for more info.
@remarks Although all remaining brushes are deleted when the application
exits, the application should try to clean up all brushes itself.
This is because wxWidgets cannot know if a pointer to the brush
object is stored in an application data structure, and there is
a risk of double deletion.
*/
virtual ~wxBrush();
/**
Returns a reference to the brush colour.
@see SetColour()
*/
virtual wxColour GetColour() const;
/**
Gets a pointer to the stipple bitmap. If the brush does not have a @c wxBRUSHSTYLE_STIPPLE
style, this bitmap may be non-@NULL but uninitialised (i.e. wxBitmap:IsOk() returns @false).
@see SetStipple()
*/
virtual wxBitmap* GetStipple() const;
/**
Returns the brush style, one of the ::wxBrushStyle values.
@see SetStyle(), SetColour(), SetStipple()
*/
virtual wxBrushStyle GetStyle() const;
/**
Returns @true if the style of the brush is any of hatched fills.
@see GetStyle()
*/
virtual bool IsHatch() const;
/**
Returns @true if the brush is initialised.
Notice that an uninitialized brush object can't be queried for any
brush properties and all calls to the accessor methods on it will
result in an assert failure.
*/
virtual bool IsOk() const;
/**
Returns @true if the brush is a valid non-transparent brush.
This method returns @true if the brush object is initialized and has a
non-transparent style. Notice that this should be used instead of
simply testing whether GetStyle() returns a style different from
wxBRUSHSTYLE_TRANSPARENT if the brush may be invalid as GetStyle()
would assert in this case.
@see IsTransparent()
@since 2.9.2.
*/
bool IsNonTransparent() const;
/**
Returns @true if the brush is transparent.
A transparent brush is simply a brush with wxBRUSHSTYLE_TRANSPARENT
style.
Notice that this function works even for non-initialized brushs (for
which it returns @false) unlike tests of the form <code>GetStyle() ==
wxBRUSHSTYLE_TRANSPARENT</code> which would assert if the brush is
invalid.
@see IsNonTransparent()
@since 2.9.2.
*/
bool IsTransparent() const;
//@{
/**
Sets the brush colour using red, green and blue values.
@see GetColour()
*/
virtual void SetColour(const wxColour& colour);
virtual void SetColour(unsigned char red, unsigned char green, unsigned char blue);
//@}
/**
Sets the stipple bitmap.
@param bitmap
The bitmap to use for stippling.
@remarks The style will be set to @c wxBRUSHSTYLE_STIPPLE, unless the bitmap
has a mask associated to it, in which case the style will be set
to @c wxBRUSHSTYLE_STIPPLE_MASK_OPAQUE.
@see wxBitmap
*/
virtual void SetStipple(const wxBitmap& bitmap);
/**
Sets the brush style.
@param style
One of the ::wxBrushStyle values.
@see GetStyle()
*/
virtual void SetStyle(wxBrushStyle style);
/**
Inequality operator.
See @ref overview_refcount_equality for more info.
*/
bool operator !=(const wxBrush& brush) const;
/**
Equality operator.
See @ref overview_refcount_equality for more info.
*/
bool operator ==(const wxBrush& brush) const;
};
/**
An empty brush.
wxBrush::IsOk() always returns @false for this object.
*/
wxBrush wxNullBrush;
/**
Blue brush.
Except for the color it has all standard attributes
(@c wxBRUSHSTYLE_SOLID, no stipple bitmap, etc...).
*/
wxBrush* wxBLUE_BRUSH;
/**
Green brush.
Except for the color it has all standard attributes
(@c wxBRUSHSTYLE_SOLID, no stipple bitmap, etc...).
*/
wxBrush* wxGREEN_BRUSH;
/**
Yellow brush.
Except for the color it has all standard attributes
(@c wxBRUSHSTYLE_SOLID, no stipple bitmap, etc...).
*/
wxBrush* wxYELLOW_BRUSH;
/**
White brush.
Except for the color it has all standard attributes
(@c wxBRUSHSTYLE_SOLID, no stipple bitmap, etc...).
*/
wxBrush* wxWHITE_BRUSH;
/**
Black brush.
Except for the color it has all standard attributes
(@c wxBRUSHSTYLE_SOLID, no stipple bitmap, etc...).
*/
wxBrush* wxBLACK_BRUSH;
/**
Grey brush.
Except for the color it has all standard attributes
(@c wxBRUSHSTYLE_SOLID, no stipple bitmap, etc...).
*/
wxBrush* wxGREY_BRUSH;
/**
Medium grey brush.
Except for the color it has all standard attributes
(@c wxBRUSHSTYLE_SOLID, no stipple bitmap, etc...).
*/
wxBrush* wxMEDIUM_GREY_BRUSH;
/**
Light grey brush.
Except for the color it has all standard attributes
(@c wxBRUSHSTYLE_SOLID, no stipple bitmap, etc...).
*/
wxBrush* wxLIGHT_GREY_BRUSH;
/**
Transparent brush.
Except for the color it has all standard attributes
(@c wxBRUSHSTYLE_SOLID, no stipple bitmap, etc...).
*/
wxBrush* wxTRANSPARENT_BRUSH;
/**
Cyan brush.
Except for the color it has all standard attributes
(@c wxBRUSHSTYLE_SOLID, no stipple bitmap, etc...).
*/
wxBrush* wxCYAN_BRUSH;
/**
Red brush.
Except for the color it has all standard attributes
(@c wxBRUSHSTYLE_SOLID, no stipple bitmap, etc...).
*/
wxBrush* wxRED_BRUSH;
/**
@class wxBrushList
A brush list is a list containing all brushes which have been created.
The application should not construct its own brush list: it should use the
object pointer ::wxTheBrushList.
@library{wxcore}
@category{gdi}
@see wxBrush
*/
class wxBrushList : public wxList
{
public:
/**
Finds a brush with the specified attributes and returns it, else creates a new
brush, adds it to the brush list, and returns it.
@param colour
Colour object.
@param style
Brush style. See ::wxBrushStyle for a list of styles.
*/
wxBrush* FindOrCreateBrush(const wxColour& colour,
wxBrushStyle style = wxBRUSHSTYLE_SOLID);
};
/**
The global wxBrushList instance.
*/
wxBrushList* wxTheBrushList;